Not enough space alert when trying to install macOS beta

Hi! I want to upgrade my Mac to macOS Big Sur. I downloaded the profile, installed it, looked for the update, and got the "Install macOS Beta" app. Unfortunately, after agreeing to the license, I had the "not enough space alert". I cleaned my Mac, but the disk space alert did not update: it tells me that I have 31.19GB available while I have 60GB available (checked using  -> About This Mac -> Storage).

How could I upgrade my Mac?

Thank you!
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ChristopheDev
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Ditto, and I have more than 42GB remaining on disk. What's the minimum disk space requirement?
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comptonsw
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Same problem. I have 100 GB free but the installer showed I have 20 GB. Then I deleted the installer and re-downloaded it, now the installer says I have 13 GB free. No idea how to fix this.
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myeviltwin
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